The Fenix 3500mAh USB 18650 Rechargeable Battery, model FX-ARBL183500U, is a high-capacity Li-ion cell designed to keep modern flashlights and gear running longer with dependable power. Featuring an integrated micro-USB charging port, it eliminates the need for a separate charger while built-in protection circuitry guards against short circuits, overcharge, over-discharge, and overheating.

This 3.6V rechargeable battery is ideal for users who rely on 18650-powered lights for everyday use, training, or extended range sessions. Its robust steel shell and pressure relief vents enhance safety, while support for up to 500 charge cycles offers long-term value. Whether you are powering a compact EDC light or a high-output duty flashlight, this Fenix cell delivers consistent performance backed by the brand’s reputation for thoughtful engineering and reliable illumination products.

• Manufacturer: Fenix
• Model: FX-ARBL183500U / ARB-L18-3500U
• Capacity: 3500mAh
• Voltage: 3.6V
• Charging: Built-in Micro-USB Port
• Protection Features: Overcharge, Over-Discharge, Short-Circuit, Overheat Protection
• Charge Cycles: Up To 500